11

Top Panel Operation and Features

the top panel display and switches. Here is a list of the different features (or modes):

Mode 1 – This is the normal engine protection RPM limit. It is active if no other RPM limit is

selected. The range of this limiter is 1000 to 12800 in steps of 100 RPM.

Mode 2 – This is the auxiliary RPM limiter, and it is activated when 12 volts is applied to the

ORANGE wire coming out of the end panel. The range is the same as the Mode 1 RPM

limiter. This RPML will over-ride the Mode 1 RPML when it is active.

Mode 3 – This is a selectable high-speed timing retard. It is selected when the YELLOW

wire coming out of the end panel has 12 volts applied. The range is 1 to 15 degrees in .1

degree steps.

Mode 4 – Start retard value. This amount of retard is applied whenever the engine RPM is

below 500. The range is .1 to 10 degrees in .1 degree steps.

Modes 5 and 6 – These two control the built-in RPM activated “window” switch. Mode 5

sets the RPM where the switch activates, and mode 6 sets the RPM where the switch

de-activates. This is useful if, for example, you want to have your nitrous system only

work within a certain RPM range. The output wire for the RPM switch is the VIOLET wire

coming out of the end panel. It is connected to ground when the switch is active, and has

a maximum current rating of 10 amps. NOTE: The RPM range for this switch is 1000 to

12, 8000 and the off RPM (mode 6) must be at least 100 RPM higher than the on RPM

(mode 5).

Mode 7 – Tach test. This feature allows you to check the accuracy of your tachometer

and any accessories connected to the tach output terminal. It also will activate the built-in

RPM switch in the Hyfire. To use the tach test feature, turn the ignition switch on without

starting the engine. Select mode 7. Turn the ignition switch off briefly, then back on again.

on the top panel. You can use the UP and DOWN arrow keys to change the RPM to the

desired value.

To return to normal operation, select mode 1. Turn the ignition switch off. The next time the

Mode 8 – Boost timing retard degrees per PSI of boost. If you have an optional MAP sensor

tells the system how many degrees to retard the timing for each pound of boost. The MAP

sensor plugs into the 3 wire connector that comes out of the front panel. If you don’t have a

MAP sensor installed, this function has no effect.

Mode 9 – Cylinder number select. Set this to however many cylinders your engine has. The

range is 3 to 12, even-fire ONLY!

Mode A – MAP sensor select. There are two MAP sensors available that are compatible

15 PSI of boost, and the other is a 3 Bar sensor (Accel P/N 74777), good for about 30 PSI

a MAP sensor installed, this function has no effect.

To use the boost retard feature, you must use the Mallory P/N 29785 harness and

appropriate MAP sensor, as referenced above. Both the harness and the MAP sensors are

available separately.

BYPASS CONNECTOR

The Bypass Connector (standard ignition bypass) fits into the mating plug of the Ignition

Control Harness to convert back to standard ignition. If you use the Bypass Connector,

use ignition ballast resistors designed for the particular distributor and coil in the wire from

the ignition switch. DO NOT put the Bypass Connector into the mating plug of a Mallory

put the Bypass Connector into the mating plug of a Mallory Electronic Advance Computer

or Remote Timing Control. Use the Power Plug to convert back to standard ignition. Also, if

you are using a Mallory Fuel Injection/Tachometer Adapter (Part No. 29074), disconnect it

(and its diode if used) as part of converting back to standard ignition. The Bypass Connector

(standard ignition bypass method to convert back to standard ignition) does not work with

magnetic pickup distributors or crank trigger ignition.

FIGURE 20

MODE

MODE

VALUE

MICROPROCESSOR CONTROLLED CD IGNITION SYSTEM

A. MAP SENSOR

9. CYLINDER NUMBER

8. BOOST DEG/PSI

7. TACH TEST

6. RPM SWITCH HIGH

5. RPM SWITCH LOW

4. START RETARD

3. SELECTABLE RETARD

2. AUX RPML

1. MAIN RPML

PART No. 685

R

R

®

PUSH THESE TO

RAISE OR LOWER

THE SELECTED

MODE VALUE

THIS WILL BLINK

DURING CRANKING

IF THE TRIGGER

SIGNAL IS PRESENT

PUSH THIS BUTTON TO

SELECT THE MODE

FIGURE 19